<template>
    <div class="star" :class="'star-'+size">
        <span class="star-item" v-for="(sc,index) in starClasses" :class="sc" :key="index"></span>
    </div>
</template>

<script>
    const CLASS_ON = 'on'
    const CLASS_HALF = 'HALF'
    const CLASS_OFF ='off'

    export default {
        props:{
            score:Number,
            size:Number
        },

        computed:{
            /*
            3.2: 3 + 0 + 2
            3.5: 3 + 1 + 1
            */

            starClasses(){
                const {score} = this
                const scs = []
                // 向scs中添加n个CLASS_ON
                const scoreInteger = Math.floor(score)
                for(let i = 0; i < scoreInteger; i++){
                    scs.push(CLASS_ON)
                }
               
                // 向scs中添加0/1个CLASS_HALF
                if((score*10-scoreInteger*10)>=5){
                    scs.push(CLASS_HALF)
                }
                
                // 向scs中添加n个CLASS_OFF
                while(scs.length <5){
                   scs.push(CLASS_OFF) 
                }
                
                return scs
            }
        }
    }
</script>

<style lang="stylus" rel="stylesheet/stylus">
    @import "../../common/stylus/mixins.styl"
  .star //2x图 3x图
    float left
    font-size 0
    .star-item
      display inline-block
      background-repeat no-repeat
    &.star-48
      .star-item
        width 20px
        height 20px
        margin-right 22px
        background-size 20px 20px
        &:last-child
          margin-right: 0
        &.on
          bg-image('./images/star48_on')
        &.half
          bg-image('./images/star48_half')
        &.off
          bg-image('./images/star48_off')
    &.star-36
      .star-item
        width 15px
        height 15px
        margin-right 6px
        background-size 15px 15px
        &:last-child
          margin-right 0
        &.on
          bg-image('./images/star36_on')
        &.half
          bg-image('./images/star36_half')
        &.off
          bg-image('./images/star36_off')
    &.star-24
      .star-item
        width 10px
        height 10px
        margin-right 3px
        background-size 10px 10px
        &:last-child
          margin-right 0
        &.on
          bg-image('./images/star24_on')
        &.half
          bg-image('./images/star24_half')
        &.off
          bg-image('./images/star24_off')
</style>
</style>